Abstract: Objective: To develop a risk score scale for Symptomatic Knee Osteoarthritis (SKOA) incident and its manual, and to provide a tool for SKOA risk assessment and related risk factors intervention in clinical and community. Methods: Based on the risk prediction model of SKOA incident of 10 variables constructed by the research group, and referring to the method used in the literature, the risk score scale was developed. And for the key points of using the scoring table, a manual was developed to standardize the use of tools. Results: The total score of the SKOA risk score scale ranged from 0 to 51, 20.5 was determined as the best cut-off point for identifying individuals at high risk developing SKOA. According to the formula: risk probability=individuals' risk value/51×100%, the probability of the individual suffering from SKOA in four years could be calculated. The manual explained the key points for standardizing usage of the scoring table from three aspects: guidelines, attachments for variable evaluation, and usage precautions. Conclusion: The SKOA risk score scale is an easy-to-use and easy-to-understand tool, can be used as a tool in practice to assess the risk of SKOA incident in four years, and to guide the development of SKOA risk intervention, evaluation and management.

Key words: Knee Osteoarthritis; risk model; incident risk; score table; manual